They are not reliable. You can dig around and find many accusations against their practice, such as trying to spam business to buy their package to improve the ratings, removing negative ratings if the business deemed that as fake, etc. While you can say those accusations needs to be verified, the fact that people can easily abuse the system still exist. As others have said, using a dedicated review platform or this forum is probably a better way to check whether a crypto business is a scam or not.